From time to time I am asked what one lens would I recommend that a photographer should buy. That depends, of course, on what one intends to photograph. And if the intent is to do wildlife photography, my answer is always the same: “Buy the Canon 100-400mm f/4.5-5.6L.”

In my view, if you shoot with a Canon DSLR, there is no other lens that is more versatile. And having such flexibility is useful, particularly when one is faced with choices between showing the environment and capturing that up close shot showing great detail.

Other photographers will insist on recommending a prime lens instead. And yes, there are some exceptional prime telephoto lenses in the Canon arsenal. The 300mm f/4L and the 400mm f/5.6L are two of my favorites. And there are those who argue that the primes are sharper. Well, that has not been my experience. I have found the 100-400 to be exceptionally sharp, especially when one takes the time to use a tripod.

Hand held shots are easily done with the 100-400mm because of the two IS modes built into the lens.

Here is an example image done hand held.

And how sharp is the lens when used with a good tripod? Take a look at this shot: